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Loans - Recorded Investment in Nonaccrual, Restructured and Loans Past Due 90 Days or More and Accruing (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Financing Receivable, Recorded Investment [Line Items] |  |  |
Impaired Financing Receivable, Recorded Investment | $ 56,564 | $ 70,426 | $ 80,664
Nonaccrual Loans | 72,056 | 87,822 |
Accruing TDRs | 20,177 | 18,228 |
Loans Past Due 90 Days or More and Accruing | 1,845 | 2,138 |
Total Nonperforming Loans | 94,078 | 108,188 |
Impaired Financing Receivable, Average Recorded Investment | 67,070 | 79,496 | 70,762
Impaired Financing Receivable, Interest Income, Cash Basis Method | 2,708 | 4,777 | 1,963
Commercial, financial and agricultural |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Impaired Financing Receivable, Recorded Investment | 18,039 | 20,624 | 30,595
Nonaccrual Loans | 16,773 | 20,057 |
Accruing TDRs | 1,291 | 600 |
Loans Past Due 90 Days or More and Accruing | 0 | 15 |
Total Nonperforming Loans | 18,064 | 20,672 |
Impaired Financing Receivable, Average Recorded Investment | 23,154 | 26,821 | 20,179
Impaired Financing Receivable, Interest Income, Cash Basis Method | 963 | 885 | 340
Commercial real estate |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Impaired Financing Receivable, Recorded Investment | 18,142 | 24,474 | 18,025
Nonaccrual Loans | 12,979 | 19,169 |
Accruing TDRs | 5,163 | 5,305 |
Loans Past Due 90 Days or More and Accruing | 0 | 0 |
Total Nonperforming Loans | 18,142 | 24,474 |
Impaired Financing Receivable, Average Recorded Investment | 21,692 | 22,828 | 17,883
Impaired Financing Receivable, Interest Income, Cash Basis Method | 903 | 884 | 550
Commercial |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Impaired Financing Receivable, Recorded Investment | 1,324 | 2,226 | 6,720
Nonaccrual Loans | 986 | 1,833 |
Accruing TDRs | 338 | 393 |
Loans Past Due 90 Days or More and Accruing | 0 | 0 |
Total Nonperforming Loans | 1,324 | 2,226 |
Impaired Financing Receivable, Average Recorded Investment | 1,729 | 5,503 | 7,732
Impaired Financing Receivable, Interest Income, Cash Basis Method | 64 | 66 | 47
Mortgage |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Nonaccrual Loans | 8 | 0 |
Accruing TDRs | 92 | 104 |
Loans Past Due 90 Days or More and Accruing | 0 | 0 |
Total Nonperforming Loans | 100 | 104 |
Installment |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Nonaccrual Loans | 52 | 61 |
Accruing TDRs | 0 | 95 |
Loans Past Due 90 Days or More and Accruing | 0 | 12 |
Total Nonperforming Loans | 52 | 168 |
Commercial |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Impaired Financing Receivable, Recorded Investment | 19,059 | 23,102 | 25,324
Nonaccrual Loans | 18,835 | 23,013 |
Accruing TDRs | 224 | 89 |
Loans Past Due 90 Days or More and Accruing | 0 | 0 |
Total Nonperforming Loans | 19,059 | 23,102 |
Impaired Financing Receivable, Average Recorded Investment | 20,490 | 24,341 | 24,968
Impaired Financing Receivable, Interest Income, Cash Basis Method | 778 | 2,942 | $ 1,026
Mortgage |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Nonaccrual Loans | 16,841 | 18,313 |
Accruing TDRs | 10,766 | 9,612 |
Loans Past Due 90 Days or More and Accruing | 568 | 887 |
Total Nonperforming Loans | 28,175 | 28,812 |
HELOC |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Nonaccrual Loans | 1,593 | 1,783 |
Accruing TDRs | 1,025 | 673 |
Loans Past Due 90 Days or More and Accruing | 14 | 25 |
Total Nonperforming Loans | 2,632 | 2,481 |
Installment |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Nonaccrual Loans | 586 | 644 |
Accruing TDRs | 616 | 609 |
Loans Past Due 90 Days or More and Accruing | 7 | 60 |
Total Nonperforming Loans | 1,209 | 1,313 |
Consumer |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Nonaccrual Loans | 3,403 | 2,949 |
Accruing TDRs | 662 | 748 |
Loans Past Due 90 Days or More and Accruing | 1,256 | 1,139 |
Total Nonperforming Loans | 5,321 | 4,836 |
Impaired Financing Receivable, Average Recorded Investment | $ 5 | $ 3 |

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- Definition Recorded investment in financing receivables that are 90 days or more past due and still accruing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 7 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5111-111524 + Details
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